TY - GEN
T1 - Ion adsorption at the goethite/water interface
T2 - 13th International Conference on Water-Rock Interaction, WRI-13
AU - Villalobos, M.
AU - Pérez-Gallegos, A.
AU - Salazar-Camacho, C.
PY - 2010
Y1 - 2010
N2 - Goethite shows an anomalous adsorption behavior when its particle size increases from nanorods to microrods, in which the adsorption capacity also increases progressively when normalized by surface area. This precludes the use of a unified thermodynamic theoretical approach to describe the adsorption behavior of (non-ideal) goethites. A new surface structural model is proposed for the latter where higher proportions of face (010) are assumed responsible for this increase in surface reactivity. The model explains quantitatively the higher adsorption capacities and pH adsorption edges of a considerable number of ions on these goethites, including protons, and is coupled to a surface complexation model for a thermodynamic description of its adsorption behavior on a per-site basis. As such, the model has highly predictive capabilities for all goethites. Additionally, the model developed for highly reactive goethites may be further extrapolated to adequately describe proton charge behavior of ferrihydrite.
AB - Goethite shows an anomalous adsorption behavior when its particle size increases from nanorods to microrods, in which the adsorption capacity also increases progressively when normalized by surface area. This precludes the use of a unified thermodynamic theoretical approach to describe the adsorption behavior of (non-ideal) goethites. A new surface structural model is proposed for the latter where higher proportions of face (010) are assumed responsible for this increase in surface reactivity. The model explains quantitatively the higher adsorption capacities and pH adsorption edges of a considerable number of ions on these goethites, including protons, and is coupled to a surface complexation model for a thermodynamic description of its adsorption behavior on a per-site basis. As such, the model has highly predictive capabilities for all goethites. Additionally, the model developed for highly reactive goethites may be further extrapolated to adequately describe proton charge behavior of ferrihydrite.
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M3 - Conference contribution
AN - SCOPUS:84860133259
SN - 9780415604260
T3 - Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13
SP - 689
EP - 692
BT - Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13
Y2 - 16 August 2010 through 20 August 2010
ER -